1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_CODE_NMETHOD_HPP
26 #define SHARE_CODE_NMETHOD_HPP
27
28 #include "code/codeBlob.hpp"
29 #include "code/pcDesc.hpp"
30 #include "oops/metadata.hpp"
31 #include "oops/method.hpp"
32
33 class AbstractCompiler;
34 class CompiledDirectCall;
35 class CompiledIC;
36 class CompiledICData;
37 class CompileTask;
38 class DepChange;
39 class Dependencies;
40 class DirectiveSet;
41 class DebugInformationRecorder;
42 class ExceptionHandlerTable;
43 class ImplicitExceptionTable;
44 class JvmtiThreadState;
45 class MetadataClosure;
46 class NativeCallWrapper;
47 class OopIterateClosure;
48 class AOTCodeReader;
49 class AOTCodeEntry;
50 class ScopeDesc;
51 class xmlStream;
52
53 // This class is used internally by nmethods, to cache
54 // exception/pc/handler information.
55
56 class ExceptionCache : public CHeapObj<mtCode> {
57 friend class VMStructs;
58 private:
59 enum { cache_size = 16 };
60 Klass* _exception_type;
61 address _pc[cache_size];
62 address _handler[cache_size];
63 volatile int _count;
64 ExceptionCache* volatile _next;
65 ExceptionCache* _purge_list_next;
66
67 inline address pc_at(int index);
68 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
69
70 inline address handler_at(int index);
71 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
72
73 inline int count();
74 // increment_count is only called under lock, but there may be concurrent readers.
75 void increment_count();
76
77 public:
78
79 ExceptionCache(Handle exception, address pc, address handler);
80
81 Klass* exception_type() { return _exception_type; }
82 ExceptionCache* next();
83 void set_next(ExceptionCache *ec);
84 ExceptionCache* purge_list_next() { return _purge_list_next; }
85 void set_purge_list_next(ExceptionCache *ec) { _purge_list_next = ec; }
86
87 address match(Handle exception, address pc);
88 bool match_exception_with_space(Handle exception) ;
89 address test_address(address addr);
90 bool add_address_and_handler(address addr, address handler) ;
91 };
92
93 // cache pc descs found in earlier inquiries
94 class PcDescCache {
95 private:
96 enum { cache_size = 4 };
97 // The array elements MUST be volatile! Several threads may modify
98 // and read from the cache concurrently. find_pc_desc_internal has
99 // returned wrong results. C++ compiler (namely xlC12) may duplicate
100 // C++ field accesses if the elements are not volatile.
101 typedef PcDesc* PcDescPtr;
102 volatile PcDescPtr _pc_descs[cache_size]; // last cache_size pc_descs found
103 public:
104 PcDescCache() { DEBUG_ONLY(_pc_descs[0] = nullptr); }
105 void init_to(PcDesc* initial_pc_desc);
106 PcDesc* find_pc_desc(int pc_offset, bool approximate);
107 void add_pc_desc(PcDesc* pc_desc);
108 PcDesc* last_pc_desc() { return _pc_descs[0]; }
109 };
110
111 class PcDescContainer : public CHeapObj<mtCode> {
112 private:
113 PcDescCache _pc_desc_cache;
114 public:
115 PcDescContainer(PcDesc* initial_pc_desc) { _pc_desc_cache.init_to(initial_pc_desc); }
116
117 PcDesc* find_pc_desc_internal(address pc, bool approximate, address code_begin,
118 PcDesc* lower, PcDesc* upper);
119
120 PcDesc* find_pc_desc(address pc, bool approximate, address code_begin, PcDesc* lower, PcDesc* upper)
121 #ifdef PRODUCT
122 {
123 PcDesc* desc = _pc_desc_cache.last_pc_desc();
124 assert(desc != nullptr, "PcDesc cache should be initialized already");
125 if (desc->pc_offset() == (pc - code_begin)) {
126 // Cached value matched
127 return desc;
128 }
129 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
130 }
131 #endif
132 ;
133 };
134
135 // nmethods (native methods) are the compiled code versions of Java methods.
136 //
137 // An nmethod contains:
138 // - Header (the nmethod structure)
139 // - Constant part (doubles, longs and floats used in nmethod)
140 // - Code part:
141 // - Code body
142 // - Exception handler
143 // - Stub code
144 // - OOP table
145 //
146 // As a CodeBlob, an nmethod references [mutable data] allocated on the C heap:
147 // - CodeBlob relocation data
148 // - Metainfo
149 // - JVMCI data
150 //
151 // An nmethod references [immutable data] allocated on C heap:
152 // - Dependency assertions data
153 // - Implicit null table array
154 // - Handler entry point array
155 // - Debugging information:
156 // - Scopes data array
157 // - Scopes pcs array
158 // - JVMCI speculations array
159 // - Nmethod reference counter
160
161 #if INCLUDE_JVMCI
162 class FailedSpeculation;
163 class JVMCINMethodData;
164 #endif
165
166 class nmethod : public CodeBlob {
167 friend class VMStructs;
168 friend class JVMCIVMStructs;
169 friend class CodeCache; // scavengable oops
170 friend class JVMCINMethodData;
171 friend class DeoptimizationScope;
172
173 #define ImmutableDataReferencesCounterSize ((int)sizeof(int))
174
175 private:
176
177 // Used to track in which deoptimize handshake this method will be deoptimized.
178 uint64_t _deoptimization_generation;
179
180 uint64_t _gc_epoch;
181
182 // Profiling counter used to figure out the hottest nmethods to record into CDS
183 volatile uint64_t _method_profiling_count;
184
185 Method* _method;
186
187 // To reduce header size union fields which usages do not overlap.
188 union {
189 // To support simple linked-list chaining of nmethods:
190 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
191 struct {
192 // These are used for compiled synchronized native methods to
193 // locate the owner and stack slot for the BasicLock. They are
194 // needed because there is no debug information for compiled native
195 // wrappers and the oop maps are insufficient to allow
196 // frame::retrieve_receiver() to work. Currently they are expected
197 // to be byte offsets from the Java stack pointer for maximum code
198 // sharing between platforms. JVMTI's GetLocalInstance() uses these
199 // offsets to find the receiver for non-static native wrapper frames.
200 ByteSize _native_receiver_sp_offset;
201 ByteSize _native_basic_lock_sp_offset;
202 };
203 };
204
205 // nmethod's read-only data
206 address _immutable_data;
207
208 PcDescContainer* _pc_desc_container;
209 ExceptionCache* volatile _exception_cache;
210
211 void* _gc_data;
212
213 struct oops_do_mark_link; // Opaque data type.
214 static nmethod* volatile _oops_do_mark_nmethods;
215 oops_do_mark_link* volatile _oops_do_mark_link;
216
217 CompiledICData* _compiled_ic_data;
218
219 // offsets for entry points
220 address _osr_entry_point; // entry point for on stack replacement
221 uint16_t _entry_offset; // entry point with class check
222 uint16_t _verified_entry_offset; // entry point without class check
223 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
224 int _immutable_data_size;
225
226 // _consts_offset == _content_offset because SECT_CONSTS is first in code buffer
227
228 int _skipped_instructions_size;
229
230 int _stub_offset;
231
232 // Offsets for different stubs section parts
233 int _exception_offset;
234 // All deoptee's will resume execution at this location described by
235 // this offset.
236 int _deopt_handler_offset;
237 // Offset (from insts_end) of the unwind handler if it exists
238 int16_t _unwind_handler_offset;
239 // Number of arguments passed on the stack
240 uint16_t _num_stack_arg_slots;
241
242 uint16_t _oops_size;
243 #if INCLUDE_JVMCI
244 // _metadata_size is not specific to JVMCI. In the non-JVMCI case, it can be derived as:
245 // _metadata_size = mutable_data_size - relocation_size
246 uint16_t _metadata_size;
247 #endif
248
249 // Offset in immutable data section
250 // _dependencies_offset == 0
251 uint16_t _nul_chk_table_offset;
252 uint16_t _handler_table_offset; // This table could be big in C1 code
253 int _scopes_pcs_offset;
254 int _scopes_data_offset;
255 #if INCLUDE_JVMCI
256 int _speculations_offset;
257 #endif
258
259 // location in frame (offset for sp) that deopt can store the original
260 // pc during a deopt.
261 int _orig_pc_offset;
262
263 int _compile_id; // which compilation made this nmethod
264 CompLevel _comp_level; // compilation level (s1)
265 CompilerType _compiler_type; // which compiler made this nmethod (u1)
266
267 AOTCodeEntry* _aot_code_entry;
268
269 bool _used; // has this nmethod ever been invoked?
270
271 // Local state used to keep track of whether unloading is happening or not
272 volatile uint8_t _is_unloading_state;
273
274 // Protected by NMethodState_lock
275 volatile signed char _state; // {not_installed, in_use, not_entrant}
276
277 // set during construction
278 uint8_t _has_unsafe_access:1, // May fault due to unsafe access.
279 _has_wide_vectors:1, // Preserve wide vectors at safepoints
280 _has_monitors:1, // Fastpath monitor detection for continuations
281 _has_scoped_access:1, // used by for shared scope closure (scopedMemoryAccess.cpp)
282 _has_flushed_dependencies:1, // Used for maintenance of dependencies (under CodeCache_lock)
283 _is_unlinked:1, // mark during class unloading
284 _load_reported:1, // used by jvmti to track if an event has been posted for this nmethod
285 _preloaded:1,
286 _has_clinit_barriers:1;
287
288 enum DeoptimizationStatus : u1 {
289 not_marked,
290 deoptimize,
291 deoptimize_noupdate,
292 deoptimize_done
293 };
294
295 volatile DeoptimizationStatus _deoptimization_status; // Used for stack deoptimization
296
297 DeoptimizationStatus deoptimization_status() const {
298 return AtomicAccess::load(&_deoptimization_status);
299 }
300
301 // Initialize fields to their default values
302 void init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets);
303
304 // Post initialization
305 void post_init();
306
307 // For native wrappers
308 nmethod(Method* method,
309 CompilerType type,
310 int nmethod_size,
311 int compile_id,
312 CodeOffsets* offsets,
313 CodeBuffer *code_buffer,
314 int frame_size,
315 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
316 ByteSize basic_lock_sp_offset, /* synchronized natives only */
317 OopMapSet* oop_maps,
318 int mutable_data_size);
319
320 // For normal JIT compiled code
321 nmethod(Method* method,
322 CompilerType type,
323 int nmethod_size,
324 int immutable_data_size,
325 int mutable_data_size,
326 int compile_id,
327 int entry_bci,
328 address immutable_data,
329 CodeOffsets* offsets,
330 int orig_pc_offset,
331 DebugInformationRecorder *recorder,
332 Dependencies* dependencies,
333 CodeBuffer *code_buffer,
334 int frame_size,
335 OopMapSet* oop_maps,
336 ExceptionHandlerTable* handler_table,
337 ImplicitExceptionTable* nul_chk_table,
338 AbstractCompiler* compiler,
339 CompLevel comp_level
340 #if INCLUDE_JVMCI
341 , char* speculations = nullptr,
342 int speculations_len = 0,
343 JVMCINMethodData* jvmci_data = nullptr
344 #endif
345 );
346
347 nmethod(const nmethod &nm);
348
349 // helper methods
350 void* operator new(size_t size, int nmethod_size, int comp_level) throw();
351 void* operator new(size_t size, int nmethod_size, CodeBlobType code_blob_type) throw();
352
353 // For method handle intrinsics: Try MethodNonProfiled, MethodProfiled and NonNMethod.
354 // Attention: Only allow NonNMethod space for special nmethods which don't need to be
355 // findable by nmethod iterators! In particular, they must not contain oops!
356 void* operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw();
357
358 const char* reloc_string_for(u_char* begin, u_char* end);
359
360 bool try_transition(signed char new_state);
361
362 // Returns true if this thread changed the state of the nmethod or
363 // false if another thread performed the transition.
364 bool make_entrant() { Unimplemented(); return false; }
365 void inc_decompile_count();
366
367 // Inform external interfaces that a compiled method has been unloaded
368 void post_compiled_method_unload();
369
370 PcDesc* find_pc_desc(address pc, bool approximate) {
371 if (_pc_desc_container == nullptr) return nullptr; // native method
372 return _pc_desc_container->find_pc_desc(pc, approximate, code_begin(), scopes_pcs_begin(), scopes_pcs_end());
373 }
374
375 // STW two-phase nmethod root processing helpers.
376 //
377 // When determining liveness of a given nmethod to do code cache unloading,
378 // some collectors need to do different things depending on whether the nmethods
379 // need to absolutely be kept alive during root processing; "strong"ly reachable
380 // nmethods are known to be kept alive at root processing, but the liveness of
381 // "weak"ly reachable ones is to be determined later.
382 //
383 // We want to allow strong and weak processing of nmethods by different threads
384 // at the same time without heavy synchronization. Additional constraints are
385 // to make sure that every nmethod is processed a minimal amount of time, and
386 // nmethods themselves are always iterated at most once at a particular time.
387 //
388 // Note that strong processing work must be a superset of weak processing work
389 // for this code to work.
390 //
391 // We store state and claim information in the _oops_do_mark_link member, using
392 // the two LSBs for the state and the remaining upper bits for linking together
393 // nmethods that were already visited.
394 // The last element is self-looped, i.e. points to itself to avoid some special
395 // "end-of-list" sentinel value.
396 //
397 // _oops_do_mark_link special values:
398 //
399 // _oops_do_mark_link == nullptr: the nmethod has not been visited at all yet, i.e.
400 // is Unclaimed.
401 //
402 // For other values, its lowest two bits indicate the following states of the nmethod:
403 //
404 // weak_request (WR): the nmethod has been claimed by a thread for weak processing
405 // weak_done (WD): weak processing has been completed for this nmethod.
406 // strong_request (SR): the nmethod has been found to need strong processing while
407 // being weak processed.
408 // strong_done (SD): strong processing has been completed for this nmethod .
409 //
410 // The following shows the _only_ possible progressions of the _oops_do_mark_link
411 // pointer.
412 //
413 // Given
414 // N as the nmethod
415 // X the current next value of _oops_do_mark_link
416 //
417 // Unclaimed (C)-> N|WR (C)-> X|WD: the nmethod has been processed weakly by
418 // a single thread.
419 // Unclaimed (C)-> N|WR (C)-> X|WD (O)-> X|SD: after weak processing has been
420 // completed (as above) another thread found that the nmethod needs strong
421 // processing after all.
422 // Unclaimed (C)-> N|WR (O)-> N|SR (C)-> X|SD: during weak processing another
423 // thread finds that the nmethod needs strong processing, marks it as such and
424 // terminates. The original thread completes strong processing.
425 // Unclaimed (C)-> N|SD (C)-> X|SD: the nmethod has been processed strongly from
426 // the beginning by a single thread.
427 //
428 // "|" describes the concatenation of bits in _oops_do_mark_link.
429 //
430 // The diagram also describes the threads responsible for changing the nmethod to
431 // the next state by marking the _transition_ with (C) and (O), which mean "current"
432 // and "other" thread respectively.
433 //
434
435 // States used for claiming nmethods during root processing.
436 static const uint claim_weak_request_tag = 0;
437 static const uint claim_weak_done_tag = 1;
438 static const uint claim_strong_request_tag = 2;
439 static const uint claim_strong_done_tag = 3;
440
441 static oops_do_mark_link* mark_link(nmethod* nm, uint tag) {
442 assert(tag <= claim_strong_done_tag, "invalid tag %u", tag);
443 assert(is_aligned(nm, 4), "nmethod pointer must have zero lower two LSB");
444 return (oops_do_mark_link*)(((uintptr_t)nm & ~0x3) | tag);
445 }
446
447 static uint extract_state(oops_do_mark_link* link) {
448 return (uint)((uintptr_t)link & 0x3);
449 }
450
451 static nmethod* extract_nmethod(oops_do_mark_link* link) {
452 return (nmethod*)((uintptr_t)link & ~0x3);
453 }
454
455 void oops_do_log_change(const char* state);
456
457 static bool oops_do_has_weak_request(oops_do_mark_link* next) {
458 return extract_state(next) == claim_weak_request_tag;
459 }
460
461 static bool oops_do_has_any_strong_state(oops_do_mark_link* next) {
462 return extract_state(next) >= claim_strong_request_tag;
463 }
464
465 // Attempt Unclaimed -> N|WR transition. Returns true if successful.
466 bool oops_do_try_claim_weak_request();
467
468 // Attempt Unclaimed -> N|SD transition. Returns the current link.
469 oops_do_mark_link* oops_do_try_claim_strong_done();
470 // Attempt N|WR -> X|WD transition. Returns nullptr if successful, X otherwise.
471 nmethod* oops_do_try_add_to_list_as_weak_done();
472
473 // Attempt X|WD -> N|SR transition. Returns the current link.
474 oops_do_mark_link* oops_do_try_add_strong_request(oops_do_mark_link* next);
475 // Attempt X|WD -> X|SD transition. Returns true if successful.
476 bool oops_do_try_claim_weak_done_as_strong_done(oops_do_mark_link* next);
477
478 // Do the N|SD -> X|SD transition.
479 void oops_do_add_to_list_as_strong_done();
480
481 // Sets this nmethod as strongly claimed (as part of N|SD -> X|SD and N|SR -> X|SD
482 // transitions).
483 void oops_do_set_strong_done(nmethod* old_head);
484
485 void record_nmethod_dependency();
486
487 nmethod* restore(address code_cache_buffer,
488 const methodHandle& method,
489 int compile_id,
490 address reloc_data,
491 GrowableArray<Handle>& oop_list,
492 GrowableArray<Metadata*>& metadata_list,
493 ImmutableOopMapSet* oop_maps,
494 address immutable_data,
495 GrowableArray<Handle>& reloc_imm_oop_list,
496 GrowableArray<Metadata*>& reloc_imm_metadata_list,
497 AOTCodeReader* aot_code_reader);
498
499 public:
500 // create nmethod using archived nmethod from AOT code cache
501 static nmethod* new_nmethod(nmethod* archived_nm,
502 const methodHandle& method,
503 AbstractCompiler* compiler,
504 int compile_id,
505 address reloc_data,
506 GrowableArray<Handle>& oop_list,
507 GrowableArray<Metadata*>& metadata_list,
508 ImmutableOopMapSet* oop_maps,
509 address immutable_data,
510 GrowableArray<Handle>& reloc_imm_oop_list,
511 GrowableArray<Metadata*>& reloc_imm_metadata_list,
512 AOTCodeReader* aot_code_reader);
513
514 // If you change anything in this enum please patch
515 // vmStructs_jvmci.cpp accordingly.
516 enum class InvalidationReason : s1 {
517 NOT_INVALIDATED = -1,
518 C1_CODEPATCH,
519 C1_DEOPTIMIZE,
520 C1_DEOPTIMIZE_FOR_PATCHING,
521 C1_PREDICATE_FAILED_TRAP,
522 CI_REPLAY,
523 UNLOADING,
524 UNLOADING_COLD,
525 JVMCI_INVALIDATE,
526 JVMCI_MATERIALIZE_VIRTUAL_OBJECT,
527 JVMCI_REPLACED_WITH_NEW_CODE,
528 JVMCI_REPROFILE,
529 MARKED_FOR_DEOPTIMIZATION,
530 MISSING_EXCEPTION_HANDLER,
531 NOT_USED,
532 OSR_INVALIDATION_BACK_BRANCH,
533 OSR_INVALIDATION_FOR_COMPILING_WITH_C1,
534 OSR_INVALIDATION_OF_LOWER_LEVEL,
535 SET_NATIVE_FUNCTION,
536 UNCOMMON_TRAP,
537 WHITEBOX_DEOPTIMIZATION,
538 ZOMBIE,
539 INVALIDATION_REASONS_COUNT
540 };
541
542
543 static const char* invalidation_reason_to_string(InvalidationReason invalidation_reason) {
544 switch (invalidation_reason) {
545 case InvalidationReason::C1_CODEPATCH:
546 return "C1 code patch";
547 case InvalidationReason::C1_DEOPTIMIZE:
548 return "C1 deoptimized";
549 case InvalidationReason::C1_DEOPTIMIZE_FOR_PATCHING:
550 return "C1 deoptimize for patching";
551 case InvalidationReason::C1_PREDICATE_FAILED_TRAP:
552 return "C1 predicate failed trap";
553 case InvalidationReason::CI_REPLAY:
554 return "CI replay";
555 case InvalidationReason::JVMCI_INVALIDATE:
556 return "JVMCI invalidate";
557 case InvalidationReason::JVMCI_MATERIALIZE_VIRTUAL_OBJECT:
558 return "JVMCI materialize virtual object";
559 case InvalidationReason::JVMCI_REPLACED_WITH_NEW_CODE:
560 return "JVMCI replaced with new code";
561 case InvalidationReason::JVMCI_REPROFILE:
562 return "JVMCI reprofile";
563 case InvalidationReason::MARKED_FOR_DEOPTIMIZATION:
564 return "marked for deoptimization";
565 case InvalidationReason::MISSING_EXCEPTION_HANDLER:
566 return "missing exception handler";
567 case InvalidationReason::NOT_USED:
568 return "not used";
569 case InvalidationReason::OSR_INVALIDATION_BACK_BRANCH:
570 return "OSR invalidation back branch";
571 case InvalidationReason::OSR_INVALIDATION_FOR_COMPILING_WITH_C1:
572 return "OSR invalidation for compiling with C1";
573 case InvalidationReason::OSR_INVALIDATION_OF_LOWER_LEVEL:
574 return "OSR invalidation of lower level";
575 case InvalidationReason::SET_NATIVE_FUNCTION:
576 return "set native function";
577 case InvalidationReason::UNCOMMON_TRAP:
578 return "uncommon trap";
579 case InvalidationReason::WHITEBOX_DEOPTIMIZATION:
580 return "whitebox deoptimization";
581 case InvalidationReason::ZOMBIE:
582 return "zombie";
583 default: {
584 assert(false, "Unhandled reason");
585 return "Unknown";
586 }
587 }
588 }
589
590 // create nmethod with entry_bci
591 static nmethod* new_nmethod(const methodHandle& method,
592 int compile_id,
593 int entry_bci,
594 CodeOffsets* offsets,
595 int orig_pc_offset,
596 DebugInformationRecorder* recorder,
597 Dependencies* dependencies,
598 CodeBuffer *code_buffer,
599 int frame_size,
600 OopMapSet* oop_maps,
601 ExceptionHandlerTable* handler_table,
602 ImplicitExceptionTable* nul_chk_table,
603 AbstractCompiler* compiler,
604 CompLevel comp_level
605 #if INCLUDE_JVMCI
606 , char* speculations = nullptr,
607 int speculations_len = 0,
608 JVMCINMethodData* jvmci_data = nullptr
609 #endif
610 );
611
612 // Relocate the nmethod to the code heap identified by code_blob_type.
613 // Returns nullptr if the code heap does not have enough space, the
614 // nmethod is unrelocatable, or the nmethod is invalidated during relocation,
615 // otherwise the relocated nmethod. The original nmethod will be marked not entrant.
616 nmethod* relocate(CodeBlobType code_blob_type);
617
618 static nmethod* new_native_nmethod(const methodHandle& method,
619 int compile_id,
620 CodeBuffer *code_buffer,
621 int vep_offset,
622 int frame_complete,
623 int frame_size,
624 ByteSize receiver_sp_offset,
625 ByteSize basic_lock_sp_offset,
626 OopMapSet* oop_maps,
627 int exception_handler = -1);
628
629 Method* method () const { return _method; }
630 uint16_t entry_bci () const { return _entry_bci; }
631 bool is_native_method() const { return _method != nullptr && _method->is_native(); }
632 bool is_java_method () const { return _method != nullptr && !_method->is_native(); }
633 bool is_osr_method () const { return _entry_bci != InvocationEntryBci; }
634
635 int orig_pc_offset() { return _orig_pc_offset; }
636 bool is_relocatable();
637
638 // Compiler task identification. Note that all OSR methods
639 // are numbered in an independent sequence if CICountOSR is true,
640 // and native method wrappers are also numbered independently if
641 // CICountNative is true.
642 int compile_id() const { return _compile_id; }
643 int comp_level() const { return _comp_level; }
644 const char* compile_kind() const;
645
646 inline bool is_compiled_by_c1 () const { return _compiler_type == compiler_c1; }
647 inline bool is_compiled_by_c2 () const { return _compiler_type == compiler_c2; }
648 inline bool is_compiled_by_jvmci() const { return _compiler_type == compiler_jvmci; }
649 CompilerType compiler_type () const { return _compiler_type; }
650 const char* compiler_name () const;
651
652 // boundaries for different parts
653 address consts_begin () const { return content_begin(); }
654 address consts_end () const { return code_begin() ; }
655 address insts_begin () const { return code_begin() ; }
656 address insts_end () const { return header_begin() + _stub_offset ; }
657 address stub_begin () const { return header_begin() + _stub_offset ; }
658 address stub_end () const { return code_end() ; }
659 address exception_begin () const { return header_begin() + _exception_offset ; }
660 address deopt_handler_begin () const { return header_begin() + _deopt_handler_offset ; }
661 address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (insts_end() - _unwind_handler_offset) : nullptr; }
662 oop* oops_begin () const { return (oop*) data_begin(); }
663 oop* oops_end () const { return (oop*) data_end(); }
664
665 // mutable data
666 Metadata** metadata_begin () const { return (Metadata**) (mutable_data_begin() + _relocation_size); }
667 #if INCLUDE_JVMCI
668 Metadata** metadata_end () const { return (Metadata**) (mutable_data_begin() + _relocation_size + _metadata_size); }
669 address jvmci_data_begin () const { return mutable_data_begin() + _relocation_size + _metadata_size; }
670 address jvmci_data_end () const { return mutable_data_end(); }
671 #else
672 Metadata** metadata_end () const { return (Metadata**) mutable_data_end(); }
673 #endif
674
675 // immutable data
676 void set_immutable_data(address data) { _immutable_data = data; }
677 address immutable_data_begin () const { return _immutable_data; }
678 address immutable_data_end () const { return _immutable_data + _immutable_data_size ; }
679 address dependencies_begin () const { return _immutable_data; }
680 address dependencies_end () const { return _immutable_data + _nul_chk_table_offset; }
681 address nul_chk_table_begin () const { return _immutable_data + _nul_chk_table_offset; }
682 address nul_chk_table_end () const { return _immutable_data + _handler_table_offset; }
683 address handler_table_begin () const { return _immutable_data + _handler_table_offset; }
684 address handler_table_end () const { return _immutable_data + _scopes_pcs_offset ; }
685 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(_immutable_data + _scopes_pcs_offset) ; }
686 PcDesc* scopes_pcs_end () const { return (PcDesc*)(_immutable_data + _scopes_data_offset) ; }
687 address scopes_data_begin () const { return _immutable_data + _scopes_data_offset ; }
688
689 #if INCLUDE_JVMCI
690 address scopes_data_end () const { return _immutable_data + _speculations_offset ; }
691 address speculations_begin () const { return _immutable_data + _speculations_offset ; }
692 address speculations_end () const { return immutable_data_end() - ImmutableDataReferencesCounterSize ; }
693 #else
694 address scopes_data_end () const { return immutable_data_end() - ImmutableDataReferencesCounterSize ; }
695 #endif
696
697 address immutable_data_references_counter_begin () const { return immutable_data_end() - ImmutableDataReferencesCounterSize ; }
698
699 // Sizes
700 int immutable_data_size() const { return _immutable_data_size; }
701 int consts_size () const { return int( consts_end () - consts_begin ()); }
702 int insts_size () const { return int( insts_end () - insts_begin ()); }
703 int stub_size () const { return int( stub_end () - stub_begin ()); }
704 int oops_size () const { return int((address) oops_end () - (address) oops_begin ()); }
705 int metadata_size () const { return int((address) metadata_end () - (address) metadata_begin ()); }
706 int scopes_data_size () const { return int( scopes_data_end () - scopes_data_begin ()); }
707 int scopes_pcs_size () const { return int((intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin ()); }
708 int dependencies_size () const { return int( dependencies_end () - dependencies_begin ()); }
709 int handler_table_size () const { return int( handler_table_end() - handler_table_begin()); }
710 int nul_chk_table_size () const { return int( nul_chk_table_end() - nul_chk_table_begin()); }
711 #if INCLUDE_JVMCI
712 int speculations_size () const { return int( speculations_end () - speculations_begin ()); }
713 int jvmci_data_size () const { return int( jvmci_data_end () - jvmci_data_begin ()); }
714 #endif
715
716 int oops_count() const { assert(oops_size() % oopSize == 0, ""); return (oops_size() / oopSize) + 1; }
717 int metadata_count() const { assert(metadata_size() % wordSize == 0, ""); return (metadata_size() / wordSize) + 1; }
718
719 int skipped_instructions_size () const { return _skipped_instructions_size; }
720 int total_size() const;
721
722 // Containment
723 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
724 // Returns true if a given address is in the 'insts' section. The method
725 // insts_contains_inclusive() is end-inclusive.
726 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
727 bool insts_contains_inclusive(address addr) const { return insts_begin () <= addr && addr <= insts_end (); }
728 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
729 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
730 bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
731 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
732 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
733 bool handler_table_contains (address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
734 bool nul_chk_table_contains (address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
735
736 // entry points
737 address entry_point() const { return code_begin() + _entry_offset; } // normal entry point
738 address verified_entry_point() const { return code_begin() + _verified_entry_offset; } // if klass is correct
739
740 enum : signed char { not_installed = -1, // in construction, only the owner doing the construction is
741 // allowed to advance state
742 in_use = 0, // executable nmethod
743 not_entrant = 1 // marked for deoptimization but activations may still exist
744 };
745
746 // flag accessing and manipulation
747 bool is_not_installed() const { return _state == not_installed; }
748 bool is_in_use() const { return _state <= in_use; }
749 bool is_not_entrant() const { return _state == not_entrant; }
750 int get_state() const { return _state; }
751
752 void clear_unloading_state();
753 // Heuristically deduce an nmethod isn't worth keeping around
754 bool is_cold();
755 bool is_unloading();
756 void do_unloading(bool unloading_occurred);
757
758 void inc_method_profiling_count();
759 uint64_t method_profiling_count();
760
761 bool make_in_use() {
762 return try_transition(in_use);
763 }
764 // Make the nmethod non entrant. The nmethod will continue to be
765 // alive. It is used when an uncommon trap happens. Returns true
766 // if this thread changed the state of the nmethod or false if
767 // another thread performed the transition.
768 bool make_not_entrant(InvalidationReason invalidation_reason, bool keep_aot_entry = false);
769 bool make_not_used() { return make_not_entrant(InvalidationReason::NOT_USED, true /* keep AOT entry */); }
770
771 bool is_marked_for_deoptimization() const { return deoptimization_status() != not_marked; }
772 bool has_been_deoptimized() const { return deoptimization_status() == deoptimize_done; }
773 void set_deoptimized_done();
774
775 bool update_recompile_counts() const {
776 // Update recompile counts when either the update is explicitly requested (deoptimize)
777 // or the nmethod is not marked for deoptimization at all (not_marked).
778 // The latter happens during uncommon traps when deoptimized nmethod is made not entrant.
779 DeoptimizationStatus status = deoptimization_status();
780 return status != deoptimize_noupdate && status != deoptimize_done;
781 }
782
783 // tells whether frames described by this nmethod can be deoptimized
784 // note: native wrappers cannot be deoptimized.
785 bool can_be_deoptimized() const { return is_java_method(); }
786
787 bool has_dependencies() { return dependencies_size() != 0; }
788 void print_dependencies_on(outputStream* out) PRODUCT_RETURN;
789 void flush_dependencies();
790
791 template<typename T>
792 T* gc_data() const { return reinterpret_cast<T*>(_gc_data); }
793 template<typename T>
794 void set_gc_data(T* gc_data) { _gc_data = reinterpret_cast<void*>(gc_data); }
795
796 bool has_unsafe_access() const { return _has_unsafe_access; }
797 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
798
799 bool has_monitors() const { return _has_monitors; }
800 void set_has_monitors(bool z) { _has_monitors = z; }
801
802 bool has_scoped_access() const { return _has_scoped_access; }
803 void set_has_scoped_access(bool z) { _has_scoped_access = z; }
804
805 bool has_wide_vectors() const { return _has_wide_vectors; }
806 void set_has_wide_vectors(bool z) { _has_wide_vectors = z; }
807
808 bool has_clinit_barriers() const { return _has_clinit_barriers; }
809 void set_has_clinit_barriers(bool z) { _has_clinit_barriers = z; }
810
811 bool preloaded() const { return _preloaded; }
812 void set_preloaded(bool z) { _preloaded = z; }
813
814 bool has_flushed_dependencies() const { return _has_flushed_dependencies; }
815 void set_has_flushed_dependencies(bool z) {
816 assert(!has_flushed_dependencies(), "should only happen once");
817 _has_flushed_dependencies = z;
818 }
819
820 bool is_unlinked() const { return _is_unlinked; }
821 void set_is_unlinked() {
822 assert(!_is_unlinked, "already unlinked");
823 _is_unlinked = true;
824 }
825
826 bool used() const { return _used; }
827 void set_used() { _used = true; }
828
829 bool is_aot() const { return _aot_code_entry != nullptr; }
830 void set_aot_code_entry(AOTCodeEntry* entry) { _aot_code_entry = entry; }
831 AOTCodeEntry* aot_code_entry() const { return _aot_code_entry; }
832
833 // Support for oops in scopes and relocs:
834 // Note: index 0 is reserved for null.
835 oop oop_at(int index) const;
836 oop oop_at_phantom(int index) const; // phantom reference
837 oop* oop_addr_at(int index) const { // for GC
838 // relocation indexes are biased by 1 (because 0 is reserved)
839 assert(index > 0 && index <= oops_count(), "must be a valid non-zero index");
840 return &oops_begin()[index - 1];
841 }
842
843 // Support for meta data in scopes and relocs:
844 // Note: index 0 is reserved for null.
845 Metadata* metadata_at(int index) const { return index == 0 ? nullptr: *metadata_addr_at(index); }
846 Metadata** metadata_addr_at(int index) const { // for GC
847 // relocation indexes are biased by 1 (because 0 is reserved)
848 assert(index > 0 && index <= metadata_count(), "must be a valid non-zero index");
849 return &metadata_begin()[index - 1];
850 }
851
852 void copy_values(GrowableArray<Handle>* array);
853 void copy_values(GrowableArray<jobject>* oops);
854 void copy_values(GrowableArray<Metadata*>* metadata);
855 void copy_values(GrowableArray<address>* metadata) {} // Nothing to do
856
857 // Relocation support
858 private:
859 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
860 inline void initialize_immediate_oop(oop* dest, jobject handle);
861
862 protected:
863 address oops_reloc_begin() const;
864
865 public:
866 void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
867 void fix_oop_relocations() { fix_oop_relocations(nullptr, nullptr, false); }
868
869 void create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list);
870
871 bool is_at_poll_return(address pc);
872 bool is_at_poll_or_poll_return(address pc);
873
874 protected:
875 // Exception cache support
876 // Note: _exception_cache may be read and cleaned concurrently.
877 ExceptionCache* exception_cache() const { return _exception_cache; }
878 ExceptionCache* exception_cache_acquire() const;
879
880 public:
881 address handler_for_exception_and_pc(Handle exception, address pc);
882 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
883 void clean_exception_cache();
884
885 void add_exception_cache_entry(ExceptionCache* new_entry);
886 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
887
888
889 // Deopt
890 // Return true is the PC is one would expect if the frame is being deopted.
891 inline bool is_deopt_pc(address pc);
892 inline bool is_deopt_entry(address pc);
893
894 // Accessor/mutator for the original pc of a frame before a frame was deopted.
895 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
896 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
897
898 const char* state() const;
899
900 bool inlinecache_check_contains(address addr) const {
901 return (addr >= code_begin() && addr < verified_entry_point());
902 }
903
904 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f);
905
906 // implicit exceptions support
907 address continuation_for_implicit_div0_exception(address pc) { return continuation_for_implicit_exception(pc, true); }
908 address continuation_for_implicit_null_exception(address pc) { return continuation_for_implicit_exception(pc, false); }
909
910 // Inline cache support for class unloading and nmethod unloading
911 private:
912 void cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all);
913
914 address continuation_for_implicit_exception(address pc, bool for_div0_check);
915
916 public:
917 // Serial version used by whitebox test
918 void cleanup_inline_caches_whitebox();
919
920 void clear_inline_caches();
921
922 // Execute nmethod barrier code, as if entering through nmethod call.
923 void run_nmethod_entry_barrier();
924
925 void verify_oop_relocations();
926
927 bool has_evol_metadata();
928
929 Method* attached_method(address call_pc);
930 Method* attached_method_before_pc(address pc);
931
932 // GC unloading support
933 // Cleans unloaded klasses and unloaded nmethods in inline caches
934
935 void unload_nmethod_caches(bool class_unloading_occurred);
936
937 void unlink_from_method();
938
939 // On-stack replacement support
940 int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
941 address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
942 nmethod* osr_link() const { return _osr_link; }
943 void set_osr_link(nmethod *n) { _osr_link = n; }
944 void invalidate_osr_method();
945
946 int num_stack_arg_slots(bool rounded = true) const {
947 return rounded ? align_up(_num_stack_arg_slots, 2) : _num_stack_arg_slots;
948 }
949
950 // Verify calls to dead methods have been cleaned.
951 void verify_clean_inline_caches();
952
953 // Unlink this nmethod from the system
954 void unlink();
955
956 // Deallocate this nmethod - called by the GC
957 void purge(bool unregister_nmethod);
958
959 // See comment at definition of _last_seen_on_stack
960 void mark_as_maybe_on_stack();
961 bool is_maybe_on_stack();
962
963 // Evolution support. We make old (discarded) compiled methods point to new Method*s.
964 void set_method(Method* method) { _method = method; }
965
966 #if INCLUDE_JVMCI
967 // Gets the JVMCI name of this nmethod.
968 const char* jvmci_name();
969
970 // Records the pending failed speculation in the
971 // JVMCI speculation log associated with this nmethod.
972 void update_speculation(JavaThread* thread);
973
974 // Gets the data specific to a JVMCI compiled method.
975 // This returns a non-nullptr value iff this nmethod was
976 // compiled by the JVMCI compiler.
977 JVMCINMethodData* jvmci_nmethod_data() const {
978 return jvmci_data_size() == 0 ? nullptr : (JVMCINMethodData*) jvmci_data_begin();
979 }
980
981 // Returns true if the runtime should NOT collect deoptimization profile for a JVMCI
982 // compiled method
983 bool jvmci_skip_profile_deopt() const;
984 #endif
985
986 void oops_do(OopClosure* f);
987
988 // All-in-one claiming of nmethods: returns true if the caller successfully claimed that
989 // nmethod.
990 bool oops_do_try_claim();
991
992 // Loom support for following nmethods on the stack
993 void follow_nmethod(OopIterateClosure* cl);
994
995 // Class containing callbacks for the oops_do_process_weak/strong() methods
996 // below.
997 class OopsDoProcessor {
998 public:
999 // Process the oops of the given nmethod based on whether it has been called
1000 // in a weak or strong processing context, i.e. apply either weak or strong
1001 // work on it.
1002 virtual void do_regular_processing(nmethod* nm) = 0;
1003 // Assuming that the oops of the given nmethod has already been its weak
1004 // processing applied, apply the remaining strong processing part.
1005 virtual void do_remaining_strong_processing(nmethod* nm) = 0;
1006 };
1007
1008 // The following two methods do the work corresponding to weak/strong nmethod
1009 // processing.
1010 void oops_do_process_weak(OopsDoProcessor* p);
1011 void oops_do_process_strong(OopsDoProcessor* p);
1012
1013 static void oops_do_marking_prologue();
1014 static void oops_do_marking_epilogue();
1015
1016 private:
1017 ScopeDesc* scope_desc_in(address begin, address end);
1018
1019 address* orig_pc_addr(const frame* fr);
1020
1021 // used by jvmti to track if the load events has been reported
1022 bool load_reported() const { return _load_reported; }
1023 void set_load_reported() { _load_reported = true; }
1024
1025 inline int get_immutable_data_references_counter() { return *((int*)immutable_data_references_counter_begin()); }
1026 inline void set_immutable_data_references_counter(int count) { *((int*)immutable_data_references_counter_begin()) = count; }
1027
1028 public:
1029 // ScopeDesc retrieval operation
1030 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
1031 // pc_desc_near returns the first PcDesc at or after the given pc.
1032 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
1033
1034 // ScopeDesc for an instruction
1035 ScopeDesc* scope_desc_at(address pc);
1036 ScopeDesc* scope_desc_near(address pc);
1037
1038 // copying of debugging information
1039 void copy_scopes_pcs(PcDesc* pcs, int count);
1040 void copy_scopes_data(address buffer, int size);
1041
1042 // Post successful compilation
1043 void post_compiled_method(CompileTask* task);
1044
1045 // jvmti support:
1046 void post_compiled_method_load_event(JvmtiThreadState* state = nullptr);
1047
1048 // verify operations
1049 void verify();
1050 void verify_scopes();
1051 void verify_interrupt_point(address interrupt_point, bool is_inline_cache);
1052
1053 // Disassemble this nmethod with additional debug information, e.g. information about blocks.
1054 void decode2(outputStream* st) const;
1055 void print_constant_pool(outputStream* st);
1056
1057 // Avoid hiding of parent's 'decode(outputStream*)' method.
1058 void decode(outputStream* st) const { decode2(st); } // just delegate here.
1059
1060 // printing support
1061 void print_on_impl(outputStream* st) const;
1062 void print_code();
1063 void print_value_on_impl(outputStream* st) const;
1064
1065 #if defined(SUPPORT_DATA_STRUCTS)
1066 // print output in opt build for disassembler library
1067 void print_relocations_on(outputStream* st) PRODUCT_RETURN;
1068 void print_pcs_on(outputStream* st);
1069 void print_scopes() { print_scopes_on(tty); }
1070 void print_scopes_on(outputStream* st) PRODUCT_RETURN;
1071 void print_handler_table();
1072 void print_nul_chk_table();
1073 void print_recorded_oop(int log_n, int index);
1074 void print_recorded_oops();
1075 void print_recorded_metadata();
1076
1077 void print_oops(outputStream* st); // oops from the underlying CodeBlob.
1078 void print_metadata(outputStream* st); // metadata in metadata pool.
1079 #else
1080 void print_pcs_on(outputStream* st) { return; }
1081 #endif
1082
1083 void print_calls(outputStream* st) PRODUCT_RETURN;
1084 static void print_statistics() PRODUCT_RETURN;
1085
1086 void maybe_print_nmethod(const DirectiveSet* directive);
1087 void print_nmethod(bool print_code);
1088
1089 void print_on_with_msg(outputStream* st, const char* msg) const;
1090
1091 // Logging
1092 void log_identity(xmlStream* log) const;
1093 void log_new_nmethod() const;
1094 void log_relocated_nmethod(nmethod* original) const;
1095 void log_state_change(InvalidationReason invalidation_reason) const;
1096
1097 // Prints block-level comments, including nmethod specific block labels:
1098 void print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels=true) const;
1099 const char* nmethod_section_label(address pos) const;
1100
1101 // returns whether this nmethod has code comments.
1102 bool has_code_comment(address begin, address end);
1103 // Prints a comment for one native instruction (reloc info, pc desc)
1104 void print_code_comment_on(outputStream* st, int column, address begin, address end);
1105
1106 // tells if this compiled method is dependent on the given changes,
1107 // and the changes have invalidated it
1108 bool check_dependency_on(DepChange& changes);
1109
1110 // Fast breakpoint support. Tells if this compiled method is
1111 // dependent on the given method. Returns true if this nmethod
1112 // corresponds to the given method as well.
1113 bool is_dependent_on_method(Method* dependee);
1114
1115 // JVMTI's GetLocalInstance() support
1116 ByteSize native_receiver_sp_offset() {
1117 assert(is_native_method(), "sanity");
1118 return _native_receiver_sp_offset;
1119 }
1120 ByteSize native_basic_lock_sp_offset() {
1121 assert(is_native_method(), "sanity");
1122 return _native_basic_lock_sp_offset;
1123 }
1124
1125 // support for code generation
1126 static ByteSize osr_entry_point_offset() { return byte_offset_of(nmethod, _osr_entry_point); }
1127 static ByteSize state_offset() { return byte_offset_of(nmethod, _state); }
1128
1129 void metadata_do(MetadataClosure* f);
1130
1131 address call_instruction_address(address pc) const;
1132
1133 void make_deoptimized();
1134 void finalize_relocations();
1135
1136 void prepare_for_archiving_impl();
1137
1138 class Vptr : public CodeBlob::Vptr {
1139 void print_on(const CodeBlob* instance, outputStream* st) const override {
1140 ttyLocker ttyl;
1141 instance->as_nmethod()->print_on_impl(st);
1142 }
1143 void print_value_on(const CodeBlob* instance, outputStream* st) const override {
1144 instance->as_nmethod()->print_value_on_impl(st);
1145 }
1146 void prepare_for_archiving(CodeBlob* instance) const override {
1147 ((nmethod*)instance)->prepare_for_archiving_impl();
1148 };
1149 };
1150
1151 static const Vptr _vpntr;
1152 };
1153
1154 struct NMethodMarkingScope : StackObj {
1155 NMethodMarkingScope() {
1156 nmethod::oops_do_marking_prologue();
1157 }
1158 ~NMethodMarkingScope() {
1159 nmethod::oops_do_marking_epilogue();
1160 }
1161 };
1162
1163 #endif // SHARE_CODE_NMETHOD_HPP